Modified slow-fast analysis method for slow-fast dynamical systems with two scales in frequency domain

A modified slow-fast analysis method is presented for the periodically excited non-autonomous dynamical system with an order gap between the exciting frequency and the natural frequency.By regarding the exciting term as a slow-varying parameter,a generalized autonomous fast subsystem can be defined,the equilibrium branches as well as the bifurcations of which can be employed to account for the mechanism of the bursting oscillations by combining the transformed phase portrait introduced.As an example,a typical periodically excited Hartley model is used to demonstrate the validness of the method,in which the exciting frequency is far less than the natural frequency.The equilibrium branches and their bifurcations of the fast subsystem with the variation of the slow-varying parameter are presented.Bursting oscillations for two typical cases are considered,which reveals that,fold bifurcation may cause the the trajectory to jump between different equilibrium branches,while Hopf bifurcation may cause the trajectory to oscillate around the stable limit cycle.

Effect of psychological nursing interventions on effectiveness and quality of life in schizophrenia patients receiving modified electroconvulsive therapy

BACKGROUND Schizophrenia is a common and severe mental disorder characterized by severe thought disturbances,hallucinations,delusions,and emotional instability.For some patients,conventional treatment methods may not effectively alleviate symptoms,necessitating the use of alternative therapeutic approaches.Modified electroconvulsive therapy(MECT)is an effective treatment modality for schizophrenia,inducing anti-depressive and antipsychotic effects through the stimulation of brain electrical activity.AIM To explore the impact of psychological nursing intervention(PNI)before and after MECT on the efficacy and quality of life of patients with schizophrenia.METHODS Eighty patients with schizophrenia who received MECT treatment from 2021 to 2023 were randomly divided into two groups:The intervention group(n=40)and the control group(n=40).The intervention group received PNI before and after MECT,while the control group received routine nursing care.The efficacy of MECT was evaluated by the Positive and Negative Syndrome Scale(PANSS)and the Clinical Global Impression Scale(CGI)before and after the treatment.The quality of life was assessed by the Short Form 36 Health Survey(SF-36)after the treatment.RESUITS The intervention group had significantly lower scores of PANSS and CGI than the control group after the treatment(P<0.05).The intervention group also had significantly higher scores of SF-36 than the control group in all domains except physical functioning(P<0.05).CONCLUSION PNI before and after MECT can improve the efficacy and quality of life of patients with schizophrenia.It is suggested that nurses should provide individualized and comprehensive psychological care for patients undergoing MECT to enhance their recovery and well-being.

APPLICATION OF THE MODIFIED METHOD OF MULTIPLE SCALES TO THE BENDING PROBLEMS FOR CIRCULAR THIN PLATE AT VERY LARGE DEFLECTION AND THE ASYMPTOTICS OF SOLUTIONS(Ⅱ)

This paper is a continuation of part (Ⅰ), on the asymptotics behaviors of the series solutions investigated in (Ⅰ). The remainder terms of the series solutions are estimated by the maximum norm.

APPLICATION OF THE MODIFIED METHOD OF MULTIPLE SCALES TO THE BENDING PROBLEMS FOR CIRCULAR THIN PLATE AT VERY LARGE DEFLECTION ANDTHE ASYMPTOTICS OF SOLUTIONS (Ⅰ)

In this paper, the modified method of multiple scales is applied to study the bending problems for circular thin plate with large deflection under the hinged and simply supported edge conditions. Theseries solutions are constructed, the boundary layer effects are analysed and their asymptotics are proved.

Modified Xiaochaihu Decoction for gastroesophageal reflux disease:A randomized double-simulation controlled trial

BACKGROUND Gastroesophageal reflux disease(GERD)has a high prevalence worldwide,and its incidence is increasing annually.Modified Xiaochaihu Decoction(MXD)could relieve the symptoms of GERD,but the effects of MXD on GERD manifestations and relapse prevention need to be further explained.Therefore,we performed a prospective,double-blind,and double-simulation study.AIM To verify the efficacy of MXD for GERD and its effect on esophageal motility.METHODS Using randomization,double-blinding,and a simulation design,288 participants with GERD were randomized to the treatment group and control group and received herbs(MXD)plus omeprazole simulation and omeprazole plus herbs simulation,respectively,for 4 wk.The GERD-Q scale score and esophageal manometry were measured at baseline,after treatment,and at 1 mo and 3 mo follow-up visits when medication was complete to evaluate recurrence indicators.RESULTS The GERD-Q scale score in both groups decreased significantly compared to those before treatment(P<0.01).However,no significant difference was observed between the two groups(P>0.05).Esophageal manometry showed that participants with lower esophageal sphincter pressure reduction and the proportion of ineffective swallowing(more than 50%)improved in both groups from baseline(P<0.01),especially in the treatment group(P<0.05).The percentage of small intermittent contractions,large intermittent contractions,and increased pre-phase contractions in the treatment group significantly improved compared with baseline(P<0.05)but did not improve in the control group(P>0.05).There was no significant difference between the groups after treatment(P>0.05).The percentage of weak esophageal contractility(distal contractile integral<450 mmHg·s·cm),improved in both groups(P<0.01),but no significant difference was observed between the groups after treatment(P>0.05).The relapse rate in the treatment group was lower than that in the control group at the 1 mo(P<0.01)and 3 mo follow-up(P<0.05).CONCLUSION MXD has a similar therapeutic effect to omeprazole in mild-to-moderate GERD.The therapeutic effect may be related to increased pressure in the lower esophageal sphincter and reduced ineffective swallowing.

Modified SIFT descriptor and key-point matching for fast and robust image mosaic

To improve the performance of the scale invariant feature transform （ SIFT）, a modified SIFT （M-SIFT） descriptor is proposed to realize fast and robust key-point extraction and matching. In descriptor generation, 3 rotation-invariant concentric-ring grids around the key-point location are used instead of 16 square grids used in the original SIFT. Then, 10 orientations are accumulated for each grid, which results in a 30-dimension descriptor. In descriptor matching, rough rejection mismatches is proposed based on the difference of grey information between matching points. The per- formance of the proposed method is tested for image mosaic on simulated and real-worid images. Experimental results show that the M-SIFT descriptor inherits the SIFT＇ s ability of being invariant to image scale and rotation, illumination change and affine distortion. Besides the time cost of feature extraction is reduced by 50% compared with the original SIFT. And the rough rejection mismatches can reject at least 70% of mismatches. The results also demonstrate that the performance of the pro- posed M-SIFT method is superior to other improved SIFT methods in speed and robustness.

Size dependent free vibration analysis of functionally graded piezoelectric micro/nano shell based on modified couple stress theory with considering thickness stretching effect

Higher-order shear and normal deformation theory is used in this paper to account thickness stretching effect for free vibration analysis of the cylindrical micro/nano shell subjected to an applied voltage and uniform temperature rising.Size dependency is included in governing equations based on the modified couple stress theory.Hamilton’s principle is used to derive governing equations of the cylindrical micro/nano shell.Solution procedure is developed using Navier technique for simply-supported boundary conditions.The numerical results are presented to investigate the effect of significant parameters such as some dimensionless geometric parameters,material properties,applied voltages and temperature rising on the free vibration responses.

Modified projective synchronization with complex scaling factors of uncertain real chaos and complex chaos

To increase the variety and security of communication, we present the definitions of modified projective synchronization with complex scaling factors （CMPS） of real chaotic systems and complex chaotic systems, where complex scaling factors establish a link between real chaos and complex chaos. Considering all situations of unknown parameters and pseudo-gradient condition, we design adaptive CMPS schemes based on the speed-gradient method for the real drive chaotic system and complex response chaotic system and for the complex drive chaotic system and the real response chaotic system, respectively. The convergence factors and dynamical control strength are added to regulate the convergence speed and increase robustness. Numerical simulations verify the feasibility and effectiveness of the presented schemes.

PNF联合下肢机器人训练对脑卒中患者姿势及步行功能的影响

目的:探讨PNF联合下肢机器人训练对脑卒中患者姿势及步行功能的影响。方法:采用随机数字表法将44例脑卒中患者分成观察组和对照组各22例,两组患者均给予常规康复治疗及PNF训练,观察组在此基础上增加下肢机器人训练,分别于治疗前及治疗4周后采用脑卒中姿势量表(PASS)、功能性步行分级量表(FAC)、Berg平衡量表、肌张力改良Ashworth量表(MAS)评估患者的姿势及平衡步行功能。结果:治疗前,两组患者各量表评分差异均无统计学意义(P>0.05)。治疗4周后,两组患者PASS、FAC功能性步行分级、Berg量表评分较治疗前差异均有统计学意义(P<0.001),且观察组较对照组差异有统计学意义(P<0.001),两组患者MAS分级差异无统计学意义(P>0.05)。结论:PNF联合下肢机器人训练,有助于改善脑卒中患者姿势及平衡功能,提高其步行能力。

苏州市大规模安置社区综合整治优先级研究

在城市更新背景下,文章以大规模安置社区为研究对象,明确其综合整治中各项性能指标的综合整治优先级及策略。基于苏州市阳山花苑的调研数据,运用修正的IPA模型对居民满意度改造优先级进行分析。研究表明,物业服务、邻里关系、购物餐饮设施方便性、景观设计、公共活动空间面积是大规模安置社区综合整治中需要优先考虑的因素,并且其优先级为:物业服务>邻里关系>购物餐饮设施方便性>景观设计>公共活动空间面积。

Predictors of Falls Efficacy Scale responses among nursing home residents in China

Objectives:The objective of this study was to examine the falls efficacy of older adults in nursing homes and the related predictors of falling.Methods:A sample of 317 older adults was recruited from 18 nursing homes in the Fujian province of China.The Modified Falls Efficacy Scale(MFES)and Kessler Psychological Distress Scale(K10)were employed to collect data.Results:The falls efficacy of older adults was moderate(7.80±1.17).The falls efficacy questionnaire item“Get dressed and undressed”scored the highest(9.12±1.440),while“Crossing roads”scored the lowest(5.77±3.371).Multiple regression analysis demonstrated that mental health status,degree of self-care,age and gender were each predictors of the falls efficacy of older adults.Conclusions:Falls efficacy enhancing programs for nursing home residents should take mental health status,degree of self-care,age and gender into account.

ON THE EVOLUTION OF LARGE SCALE STRUCTURES IN THREE-DIMENSIONAL MIXING LAYERS

In this paper, several mathematical models for the large scale structures in some special kinds of mixing layers, which might be practically useful for enhancing the mixing, are proposed. First, the linear growth rate of the large scale structures in the mixing layers was calculated. Then, using the much improved weakly non-linear theory, combined with the energy method, the non-linear evolution of large scale structures in two special mixing layer configurations is calculated. One of the mixing lavers has equal magnitudes of the upstream velocity vectors, while the angles between the velocity vectors and the trailing edge were pi /2 - phi and pi /2 + phi, respectively. The other mixing layer was generated by a splitter-plate with a 45-degree-sweep trailing edge.

THE METHOD OF MULTIPLE SCALES APPLIED TO THE NONLINEAR STABILITY PROBLEM OF A TRUNCATED SHALLOW SPHERICAL SHELL OF VARIABLE THICKNESS WITH THE LARGE GEOMETRICAL PARAMETER

Using the modified method of multiple scales, the nonlinear stability of a truncated shallow spherical shell of variable thickness with a nondeformable rigid body at the center under compound loads is investigated. When the geometrical parameter k is larger, the uniformly valid asymptotic solutions of this problem are obtained and the remainder terms are estimated.

改良版加拿大急诊分诊量表在产科急诊分诊中的应用效果

目的探讨改良版加拿大急诊分诊量表(CTAS)在产科急诊中的应用效果。方法选取2020年7月至12月首都医科大学附属北京妇产医院急诊科就诊的3600名孕妇为研究对象,按照就诊月份将其分为对照组(7、9、11月就诊的孕妇)和观察组(8、10、12月就诊的孕妇),每组1800名。对照组采用常规预检分诊标准,观察组采用改良版CTAS分诊标准进行预检分诊。比较两组分诊级别、等候时间、分诊准确率及满意度。结果两组分诊级别比较,差异有统计学意义(P<0.05)。观察组Ⅱ、Ⅲ、Ⅳ级分诊等待时间短于对照组,差异有统计学意义(P<0.05)。观察组分诊准确率及满意度高于对照组,差异有统计学意义(P<0.05)。结论采用改良版CTAS分诊标准能明显缩短孕妇等候时间、提高分诊准确率和满意度,可作为产科急诊分诊工具之一。

基于改良Caprini风险评估的预见性护理对不同程度创面烧伤患者静脉血栓栓塞症的预防效果

目的探讨基于改良Caprini风险评估的预见性护理对不同程度创面烧伤患者静脉血栓栓塞症(VTE)的预防效果。方法将2022年1月至2023年9月浙江省金华市中心医院烧伤科就诊的334例烧伤患者作为研究对象,按非同期队列研究方法将其分为对照组和观察组,对照组(186例)接受Caprini风险评估的常规VTE护理,观察组(148例)接受改良Caprini风险评估的预见性护理。干预后,比较两组VTE发生率、VTE中高危识别率和凝血功能。结果干预后,观察组VTE发生率低于对照组,差异有统计学意义(P<0.05);干预后,观察组VTE中高危识别率高于对照组,差异有统计学意义(P<0.05)。干预后,两组凝血酶原时间(PT)、活化部分凝血酶时间(APTT)短于干预前,纤维蛋白原(FIB)高于干预前,且观察组PT、APTT短于对照组,观察组FIB高于对照组,差异有统计学意义(P<0.05)。结论对于烧伤患者而言,相对于Caprini风险评估的常规VTE护理,改良Caprini风险评估的预见性护理能够更好地预防VTE的发生,改善患者的凝血功能,值得推广使用。

干细胞移植术后环孢素相关脑病早期预警评分表的制定及应用

目的探讨造血干细胞移植(hematopoieitic stem cell transplantation,HSCT)术后运用环孢素(cyclosporine,CsA)相关脑病患者的改良早期预警评分表的制定及应用效果。方法选取2017年1月至2022年1月收治的行HSCT术后采用CsA治疗产生CsA相关脑病患者125例作为研究对象,运用MEWS评分表找出截断点,在原有MEWS评分表的基础上增加CsA浓度、白蛋白(alibumin,ALB)参数并进行赋值、信度、效度验证,建立一个能准确帮助医护人员早期识别CsA相关脑病的校正版MEWS评分表,运用校正版MEWS评分表评估2022年2月~2022年7月收治的行干细胞移植术后运用CsA治疗的27例CsA相关脑病患者的截断点,针对评估结果进行干预,观察CsA相关脑病患者的发生率。结果单因素分析证实:心率、收缩压、呼吸频率、体温、意识、CsA血药浓度和Alb均是影响HSCT手术及CsA相关脑病患者的单因素(P<0.05)。Logistic回归分析证实:心率、收缩压、呼吸频率、体温、意识、CsA血药浓度和Alb均是影响校正版MEWS评分量表的多因素(P<0.05)。评估者信度检验:所纳检验对象与评估者有相关关系,ICC=0.904(0.823≤95%CI≤0.978),说明校正版MEWS评分量表的评定者之间的信度良好。校正版MEWS评分量表的内部一致性检验:校正版MEWS评分量表的总Cronbach'sα系数为0.867,各条目的Cronbach'sα系数(0.815~0.859)良好,条目得分系数与校正版MEWS评分量表总分的相关系数为0.452~0.925(P<0.05),说明各条目能达到评估目的。校正版MEWS评分量表6个条目平均CVR为0.880,探索性因子分析显示各条目结构良好。主成分分析法结果显示,公因子心率、收缩压的生成特征值均>1,能解释78.652%的总变异量。所纳125例HSCT术后CsA治疗患者中,患CsA相关脑病者占总数的16.80%。运用校正版MEWS评分量表对2022年2~7月收治的行HSCT术后CsA治疗的27例患者进行预警干预(医疗干预)后CsA相关脑病发生率为3.70%,较2017年1月至2022年1月所纳CsA相关脑病者占比(16.80%)更低,差异显著(P<0.05)。结论与MEWS评分量表相比,校正版MEWS评分量表的灵敏度和准确率更高,对降低HSCT手术及CsA相关脑病患病率有良好的预测作用,有益于CSA相关脑病的后续治疗。

术后早期连续血糖监测与取栓后急性缺血性卒中患者预后评估的相关性研究

目的 探讨急性缺血性卒中患者机械取栓术后1~7 d连续血糖水平与预后的相关性。方法 回顾性选取首都医科大学附属北京朝阳医院2021年1月1日至2023年8月31日期间接受机械取栓手术的151例急性缺血性卒中患者为研究对象,收集术后1~7 d空腹及早、午、晚餐后2 h的指尖血糖数据。出院后随访患者术后90 d改良Rankin评分(mRS),采用双变量相关性分析法研究术后1~7 d血糖水平与患者预后的相关性。结果 患者术后第1天(空腹,P=0.028)、第2天(午餐后,P=0.027)、第4天(早餐后,P=0.014)、第5天(午餐后,P=0.006)及第6天(早餐后,P=0.043)血糖水平与术后90 d mRS评分存在显著相关性。结论 术后1~7 d血糖控制对患者预后恢复有显著影响,高血糖状态与术后90 d较差的神经功能障碍显著相关。有效的血糖管理策略可以为患者提供更有利的康复条件和改善预后的可能性。

谷红注射液治疗急性缺血性脑卒中的多中心、随机、双盲、安慰剂对照临床研究

目的观察谷红注射液治疗急性缺血性脑卒中患者的临床疗效和安全性。方法该研究为一项多中心、前瞻性研究,采用随机、双盲、平行对照的临床试验设计方法。纳入2021年7月22日至2024年4月30日就诊于31家医院的急性缺血性脑卒中患者2000例。经筛选随机分组后,试验组纳入999例,对照组纳入1000例。试验组给予谷红注射液,对照组给予安慰剂(生理盐水),2组疗程均为10 d。比较2组患者发病90 d后的改良Rankin量表(mRS)相对于基线期的变化情况,评估经治疗后mRS评分≤2分的患者比例。观察并记录2组患者治疗期间出现的不良反应情况。结果发病90 d后,试验组mRS评分≤2分的患者比例[71.10%,710/999]高于对照组[65.10%,651/1000],差异有统计学意义(P<0.05)。在整个试验期间,试验组不良反应的发生率为0.70%,对照组不良反应的发生率为0.40%,差异无统计学意义(P>0.05)。综合不良反应、临床实验室检查、心电图和生命体征等安全性评价指标结果,试验组与对照组安全性相当。结论谷红注射液具有疗效确切、安全可靠的优点,且能够提高临床顺应性,可有效改善急性缺血性脑卒中患者的临床症状,提高生活质量,值得临床推广使用。

保偏光纤制备及其参数测试原理

为了研制工作波长为1310 nm的保偏光纤,采用改进的化学气相沉积工艺制备了保偏光纤预制捧和应力棒,经加工、拼接、清洗、拉丝工艺后,得到几何尺寸精确的高质量保偏光纤;同时搭建了高效测试系统,采用折射近场法、远场扫描法、视频灰度技术(传输近场),分别测量了预制棒的折射率分布和几何尺寸,保偏光纤模场直径、数值孔径、几何尺寸等关键参数。结果表明,此标准化测试系统操作流程简单、结果精确;模场直径为6.26μm,数值孔径为0.23,包涂直径80μm/135μm/165μm(精度±0.7μm);终检测试合格的光纤成品随机抽样16.25%,高低温老化实验后拍长、串音变化小。所研制的保偏光纤性能稳定,几何尺寸精确、结构均匀、损耗低,具有优良保偏性能,已广泛应用于实际生产中。

动脉瘤性蛛网膜下隙出血致急性脑积水患者出院6个月后的预后状况及其影响因素

目的探讨动脉瘤性蛛网膜下隙出血(aSAH)致急性脑积水患者出院6个月后的预后状况及其影响因素。方法回顾性分析2022年1月至2024年1月郑州人民医院神经外科收治的110例a SAH后急性脑积水患者的病历资料,所有患者出院6个月后均采用改良的Rankin量表(mRS)评分评估患者的预后,mRS评分>2分为预后不良,m RS评分≤2分为预后良好,将出院后6个月预后不良的25例作为预后不良组,预后良好的85例作为预后良好组。比较两组患者的年龄、性别、吸烟史、饮酒史、糖尿病史、高血压史、动脉瘤位置、动脉瘤直径、发病至手术时间、手术方式、分流依赖性脑积水、迟发性脑缺血、颅内出血等临床资料。采用Logistic回归分析影响a SAH后急性脑积水出院6个月后预后的危险因素。结果两组患者的年龄、性别、吸烟史、饮酒史、糖尿病史、高血压史、动脉瘤位置、动脉瘤直径、发病至手术时间、手术方式比较差异均无统计学意义(P>0.05);预后不良组患者的分流依赖性脑积水、迟发性脑缺血、颅内出血的占比分别为60.00%、68.00%、64.00%,明显高于预后良好组的23.53%、29.41%、25.88%,差异均有统计学意义(P<0.05);Logistic回归分析结果显示,分流依赖性脑积水、迟发性脑缺血、颅内出血均是影响a SAH后急性脑积水出院6个月后预后的危险因素(P<0.05)。结论a SAH致急性脑积水患者出院6个月后的预后状况良好,分流依赖性脑积水、迟发性脑缺血、颅内出血均是影响aSAH致急性脑积水患者出院6个月后预后的危险因素。